Laser-structured film-free nonwoven outercovers for soft, breathable barriers

Overview

This technology introduces a laser surface structuring approach to create film-free outercover materials based on lightweight synthetic nonwovens. By generating hierarchical micro/nano-structures with femtosecond or high-repetition-rate nanosecond lasers, the materials achieve liquid barrier performance—targeting no strikethrough at approximately 62 mbar for urine, bowel movement, and menses—while preserving high breathability, softness, drape, and low noise. The process involves no continuous film and zero material add-on, and retains the base nonwoven's tensile properties.

Primary applications include hygiene products (diapers, adult incontinence, and feminine care) where soft, breathable, low-noise liquid barriers are essential. The approach also offers optional laser surface activation with ultra-low-add-on hydrophobic grafting to further enhance barrier performance and stain masking.

Technical specifications

Key features:

• Hierarchical micro/nano surface structures created by femtosecond or high-repetition-rate nanosecond lasers on lightweight nonwovens (40–55 gsm spunbond, spunlace, or SMS fabrics)
• Liquid entry pressure raised through controlled surface topography rather than pore blockage or densification, maintaining high moisture vapor transmission rate (>2000 g/m²/24 h) and air permeability
• Zero or ultra-low material add-on keeps basis weight low and supports a clear pathway to the cost target of under $80 per thousand square yards
• Optional ultra-low-add-on hydrophobic grafting for enhanced barrier performance and stain masking
• Retains base fabric tensile properties, softness, drape, and low noise

Validation plan:

• Months 1–4: selection of commercial and lab-scale nonwovens, generation of hierarchical surface structures, and rapid screening for hydrohead, moisture vapor transmission rate, air permeability, cup crush, and tensile properties to down-select 2–3 leading structures
• Months 5–10: full barrier testing against urine, simulated running bowel movement, and menses at approximately 62 mbar; stain-masking evaluation, noise measurement, durability, and complete tensile characterization
• Months 11–18: laser process window optimization for throughput and roll-to-roll compatibility, converting trials, product-level testing, and delivery of a detailed cost model plus scale-up roadmap

Technology readiness level

The technology is at an early-to-mid development stage. Laboratory results have already demonstrated elevated barrier performance with retained tactile properties on lightweight nonwovens, enabling rapid sample screening. The proposed validation path advances the technology toward higher readiness levels through systematic performance testing, roll-to-roll compatible process optimization, and scale-up planning.